Reversible moist-adiabatic process

From Glossary of Meteorology
Revision as of 18:52, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == reversible moist-adiabatic process == </div> <div class="definition"><div class="short_defi...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

reversible moist-adiabatic process

A moist-adiabatic process in which the air is maintained at saturation by the evaporation or condensation of water substance, the enthalpy of water vapor formed or removed being supplied by or to the air, respectively.

In contrast to a pseudoadiabatic expansion, the liquid water that condenses in an air parcel expanding through a reversible moist-adiabatic process is carried with the parcel, so that subsequent compression occurs with moist-adiabatic warming, leading to the original state. This can only happen if the condensed water drops are small enough to have negligible fallout velocities. The moist-adiabatic lapse rate for the reversible process is given by
where Γrm is the reversible moist-adiabatic lapse rate; g is gravity; rv, rl, and rt are the mixing of water vapor, liquid water, and total water; cpd, cpv, and c are the specific heats at constant pressure of dry air, water vapor, and liquid water; Lv is the heat of vaporization; R is the dry air gas constant; ε is the ratio of the gas constants of dry air and water vapor (≈ 0.622); and T is temperature.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact [email protected]. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.